The Reliance Medical Relief Reusable Hot and Cold Packs help soothe muscular discomfort and help to reduce swelling and bruising. The hot pack will assist in increasing circulation, with temporary relief to muscle aches, back pain, sinusitis or menstrual cramps. The cold pack will assist in temporarily reducing swelling, toothache, headache and fever. Each compress can be used more than once, with the plastic outer covering ensuring they remain clean for repeated use.